holley bog
Thread Starter
Racer
Joined: Jul 2009
Posts: 344
Likes: 5
From: oak harbor wa
holley bog
77 corvette sbc cam specs 204 I 214 E 488 lift
ok holley carb 080508-1 (750 vaccum secondary)
it was a good carb until i took it off car for cam change. just so everyone knows i put a known good carb and it runs great.
ok as of now it has a metering block in the back and its vaccum secondarys kinda like a 3310 holley
the problem: car bogs at wot only under load
soultions failed: 1.changed vacuum secondary springs from white to black with the best being purple spring but still a bog 2. rebuilt carb(new power valve and gaskets) 3. jetted front from 66 to 68 then to 70 same problem. Holley tech said to run 76 in rear as thats what cam stock so i did 4. set timing at 10,12,14,15,16,18. (vaccum at idle 18) 5. changed intake gaskets and carb base gaskets again 6. changed fuel pump even though i was getting 6psi and filters and filters in carb. 7. disconnected vaccum secondary linkage. 8. all thats left is to throw it the trash ive seen old quadrajets not give me this many problems
Safety Car
Joined: Oct 2000
Posts: 3,593
Likes: 103
From: Southern Indiana
You really didn't need to put another metering plate in the back did you?
Anyway disconnect the back barrels and just run off the front of the carb, at least you might eliminate some question.
Anyway disconnect the back barrels and just run off the front of the carb, at least you might eliminate some question.
Pro
Joined: Nov 2008
Posts: 543
Likes: 24
From: Riverside CA
You need to start playing with the accelerator pump shot. What size squiters are you using? Start adjusting the pump spring and also moving the cam from 1 to 2 see if that helps.
Welcome to the tuner world, I'm there now as well.
Welcome to the tuner world, I'm there now as well.
Thread Starter
Racer
Joined: Jul 2009
Posts: 344
Likes: 5
From: oak harbor wa
tim i didnt put the metering block on the back it was on the car when i got it. i did disconnect linkage from back barrels and bog is still there at wot.....eric the only thing i havent played with is the squirters and the cam, im about 70 bucks into stupid springs and jets that holley told me to go buy and try.ill look tomorrow at squirter size and move cam it is a blue one
Thread Starter
Racer
Joined: Jul 2009
Posts: 344
Likes: 5
From: oak harbor wa
well i think i have her fixed squirter size is 28 blue pump cam on 2 hole. i wasnt getting fuel all the way through throttle movement what ever yall do dont listen to holley make sure you have fuel all the way through throttle movement out of squirters mine was only about half way so i was running big time lean partial throttle i was okay but at full i was only getting air 
Le Mans Master
Joined: Oct 2000
Posts: 8,897
Likes: 1,357
From: Santa Ana CA
well i think i have her fixed squirter size is 28 blue pump cam on 2 hole. i wasnt getting fuel all the way through throttle movement what ever yall do dont listen to holley make sure you have fuel all the way through throttle movement out of squirters mine was only about half way so i was running big time lean partial throttle i was okay but at full i was only getting air
Note the A/F ratio at the point of bog.
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